Hydraulic jack.



N. KOHL & P. I. JOYCE.

HYDRAULIC JACK. APrLIoATIoN FILED MAY 6, 190s.

Patented Apr. 13, 1909.

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` nary the movement of the unrrnn entras rrnnr y cierro,

NICHOLAS KOHL AND FRANK I. .IOYCE,'OF DAYTON," OHIO, ASSIGNORSTO 'IHl'fi` JOYCE- i CRIDLAND COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

HYDRAULIC JACK.

Specification of Letters Patent.

Patented April 1c, `rece.

To all whom it' mayconcem:

Be it `kno'wn that we, NICHOLAs- KOHL and FRANK I. Jorcn, citizens of the United States, and residents of Dayton, county oi Montgomery, State of Ohio, have invented certain new and useful Improyements in Hydraulic Jacks, of which the following isa full, clear, and exact description, reference being had tothe accompanying drawings, forming part of this specication.

Our invention relates to im roveinents in hydraulic jacks more particu desi 'ned for high tonnages, in whichordilifting head is necessarily slow, and the purpose of our inventionsis to provide a construction in which the ram may be4 moved rapidly up to the load automaticallyand without the necessity nso ' cylinder 6, to the of any levers. Y

In the drawings Figure 1 is a central verticalsection oia hydraulic jack, embodying our im rovement. Fig. 2 isa side elevation of the ydraulic jack, partly in vertical section, showing a modified form of' the automatic auxiliary lun erf l is the cylin rica case for the o parts, rovided with the substantiainto wliich the cylinder is screwed.

3 is the ram which carries the head a, upon its upper end, and provided'with the pump manual. adjustment of the valves Vor erating base 2,

block 5, secured to the lower innerend or" the ram. This'pump block is provided with the usual central recess 6, within which works the piston head 7 of the pump rod 8. v rr9 is the suction passage from the pum cylinder 6, to thefram chamber; 37 whicli opens into and is a continuationi the reservoir 10, in the head oi the ram.'V

11 is the discharge passage from the pum force chamber 12. P

discharge'passage is provided with the usual discharge valve 13, andthe discharge stop 14, while thesuction passage V9, is provided with a suction valve 15, suction stop 16, and a trip rod 17, with the trip rod spring 1'8, and the trip rod stop19. i Screwthreaded onthe lower end of the pump rod 8, a pump block for t e t row of the the trip collar 20, for tripping t e lack.

The upper end of the pump ro 8, is secured by the knuckle joint 21, to the rocker ump rod, is

arm 22, mountedon the rockerl shaft 23,` e5 journaledin suitable bearing, within the ram arly 'in jacks provided with a packing 'ring 30.

. be raised This l circu a t1on of the' liquid,and the ro er distance above thel headv 1, and extending throu'ghi the case, vided on the outside with the 24, by means oi which the ated to liftv the ram.

T he parts of the hydraulic jack which have been thus briefly described above, are the ordinaryand usual parts of our hydraulic jack, asheretofore constructed. rlhe area of the pump rod in comparison with the sectional area of the force chamber, being necessarily small for acks of high tonnages, the lift of the ram with each s trokeof the pump rod, isconsequently slight, and in order that the ranrmay be raised rapidly to the load, we provide as follows: Mounted looselyon the pump rod 8, is an auxiliary plunger 25, provided with apacking ring 26, to iit tightly in the=ram cylinder. Ample prooperating lever pump rod is actu space 27, is provided around the pump rod,

Afor the normal circulation of the liquid in the ram, above and below the auxiliary plunger. 28 is a collar secured on the pump rod by the pin 29, and the lower surface oi' this collar is 31 is a pin or stud which extends out from the pump rod 8, a short distance below the auxiliary plunger, and arranged to contact therewith in the movement oi the pump rod. l 32 isa small hole drilled directly through the auxiliary plunger.

' Instead of through the this opening 32 check valve 33, spring tension. UponV the -up stroke of the pump rod, the collar 28jwill be drawn away from the aux# iliary plunger, and the auxiliary plunger'willbyjthestud 31, leaving a free circuspace 27, around the pump rod, for the ack will operate in the ordinary way, the iquid -being drawnthrough the suction passage 9, into the pumpy chamber 6, while 011 the down stroke of the pump rod, the collar 28', with its providing `a small opening 32,

, maybe provided with a as, shown m Fig. 2, under latin unger withoutka check valve;^

packing ring 30, will contact with theauxilv lary plunger and close the opening 27, and

luntil the head reaches the load the'aur'iliary plunger 25,J will serve as the pump piston, and force the 'liquid rapidly through t e suctioi'and discharge passageways oi' thepump block into .the force chamber, and thus-the ram Will be raised rapidly'tethe loadr- The.

size of the opening 32, through the auxiliary plunger, or the tensionj ofthejspi'ing of. the

"check valve 33, when the valve construction .is used, is so designedwith relation to the parts, that when the jack is operated without the load, there will be ample pressure un tion, but that w en the'ram head is beingv raised to the load, the 4auxiliary plunger auto.-

matically comes-into play to raise the ram 'at full speed.'

Having thus described our invention, what l We claim as new and desire to secure by Let'- ters Patent, is:

1. a jack of the class described provided witha ram, pump rod and pump, an auxiliary plunger fmounted loosely on the pump rod in the ram cylinder, and fixed stopson the pump rod to engage the plunger, acting on opposite sides of the plunger, with passages throughv thev plunger of different size, and means for closing automatically the larger passageway during the down stroke of the pump rod, to bring the auxiliary plunger into action. f 2. In al jack of the class described, providedwith a ram, pump rod and pump, an auxiliary plunger mounted loosely on the pump rod mv the ram cylinder, with means on the pump rod to engage the plunger acting on opposite sides the eof, passageways through the plunger o'f did rentsize, one passageway of a size to permit ready circulation of the pump liquid and the-otheradapted to impede the circulation, with means for automatically closing the larver passage way during the down stroke of the pump rod, as and for the purpose described.

3. In a hydraulic-jack, the/combination withv the ram, limp ro'd and pump, with suction and disc ja ge passagestherefor, of an auxiliary plung rin the ram cilinder loosely mounted etween sto s on Ivt e pump rod,

with passage ways t rough the auxiliary sage fway during the down stroke of the pump rod, whereby when idly acting the auxiliary It follows from this that plunger, one passage way larger than the suction passage from the pump, the `other smaller than the discharge passage therefrom, and means for, closing the larger pasplunger will be` brought. automatically into action.

' 4. In a hydraulic jack the combination with the ram, pump rod and pump, an auxrod in the ram cylinder, 'a stop on the ump rod l'or raising the plunger,'and a col ar secured to the pump rod above the plunger, al1l opening through the plunger with packin on the under surface of the collary to cut o said opening on the down stroke of the ump rod, and an additional opening throng the I plunger of small size, out of alinement with said collar and not affected by the movementl thereof.

5. In a hydraulic jack the combination with the ram, pump rod and pump, an auxiliary plunger mountecd loosely on the pump rod in the ram cylinder, a stop on the pump rod for raising the plunger, and a collar se cured to the pump rod above the plungerhan opening through theplunger with packing ,I

on theunder surface of the collar to cut ofi said opening on the down'stroke of the ump rod, and an additional opening throug the plunger, out of alinement, with said-collarv and not aiiected loy the movement thereof, and a check valve in said opening under, spring tension, to retard the passa e of the punp liquid on the down stroke of t epump ro In a jack ofthe class described, provided with a ram, pump rod and pump, an

THOMAS B. HERRMAN. y V

iliary plunger mounted loosely on the pump` o 

